Lowa Women&#39;s Albula GTX Hiking Boot,Dark Blue,7.5 M US,Lowa,ALBULA GTX WS" /> 100% Leather Vibram sole Shaft measures approximately 6" from arch Boot opening measures approximately 9" around Waterproof and breathable Gore-Tex membrane Soft ankle flex for fit and comfort Lowa Control System manages moisture to help eliminate blisters and hot spots Anatomical C4 Tongue cradles the foot X-Lacing with tongue stud allows for better pressure distribution Full-length nylon shank and SPS System help to control over-probation and suspiration, reducing fatigue and potential injury when covering long distances